TY JOUR TI Estimating the absolute total electron content based on single-frequency satellite radio navigation GPS/GLONASS data KW ionosphere KW GPS KW GLONASS KW total electron content KW single-frequency data JO Solar-Terrestrial Physics AU Yasyukevich, Y.V. AU Mylnikova, A.A. AU Ivanov, V.B. PY 2017 IS 3 PB INFRA-M Academic Publishing LLC.